Characteristics And Applications Of Soft Magnetic Materials

Characteristics of Soft Magnetic Materials

Under low magnetic fields, magnetization can reach 80% -90% of its saturation magnetization strength, which means its initial magnetic permeability should be high and the saturation magnetization strength should also be high.

2. There is no (as small as possible) crystal anisotropy.

3. The magnetic contraction constant should be small to avoid stress causing anisotropy; These are mostly soft magnetic materials made of metals or alloys.

When used in alternating magnetic fields, the hysteresis loop of soft magnetic materials should be as small as possible, as the magnetic loss is proportional to the area of the hysteresis loop. At low frequencies, soft magnetic materials are required to have high initial permeability, high saturation magnetization, and low coercivity. However, when used at higher frequencies, the requirement for high saturation magnetization intensity is limited. When used at very high frequencies, the requirement for high resistance of soft magnetic materials is the most important because eddy current loss is proportional to the square of frequency; Most cities choose to use ferrite soft magnetic materials.

Application of Soft Magnetic Materials

1. The application of high current devices is generally used under quasi-static or low-frequency, high current conditions; Iron cores such as electromagnets, power transformers, motors, etc.

2. The application of weak current devices is generally used at high frequencies and weak currents. For example, the magnetic core of the receiving antenna coil in communication equipment, the iron core of small transformers in electronic circuits, etc